a) ( x - 1/2 )2 = 0
<=> x - 1/2 = 0
<=> x = 1/2
b) ( x - 2 )2 = 1
<=> x - 2 = { 1; -1 }
<=> x = { 3; 1 }
c) ( 2x - 1 )3 = -8 = ( -2 )3
<=> 2x - 1 = -2
<=> 2x = -1
<=> x = -1/2
d) ( x + 1/2 )2 = 1/16
<=> x + 1/2 = { 1/4; -1/4 }
<=> x = { -1/4; -3/4 }
a.
(x-1/2)^2=0\(\Rightarrow\)x-1/2=0\(\Rightarrow\)x=1/2
b
(x-2)^2=1\(\Rightarrow\)x-2\(\in\){1;-1}
\(\Rightarrow\)x\(\in\){3;1}
c
(2x-1)^3=-8\(\Rightarrow\)2x-1=-2
\(\Rightarrow\)2x=-1
\(\Rightarrow\)x=-1/2
d
(x+1/2)^2=1/16\(\Rightarrow\)x+1/2\(\in\){1/4;-1/4}
\(\Rightarrow\)x\(\in\){-1/4;-3/4}
bai nay tuy kho nhunh doi voi minh thi biet thua de nhu an banh vay